Federal safety regulators are investigating reports of fires in the driver's side doors of Chevrolet TrailBlazer SUVs from the 2006 and 2007 model years.
The National Highway Traffic Safety Administration says more than 309,000 vehicles could be affected. So far the vehicles have not been recalled.
The fires appear to have started in the driver's side power window switch and related electrical parts. Regulators began investigating the 2007 Toyota Camry and RAV4 for the same problem last week.
Safety regulators have gotten 12 complaints about the problem, including 10 fires. GM says no one has been hurt and no vehicles were destroyed.
Company spokesman Alan Adler says he doesn't know if GM bought
its switches from the same supplier as Toyota.